Your DXG probably came loaded with 2.5.5. You can see this by going home/menu/settings. Look at the bottom of the screen and it will tell you what version it is.
I have both the k3 (wife is now using this) and DXG (my favorite) and while I like the web browser on the k3 (esp. the zoom-in) I still like the DXG. Because of the larger screen, the DXG does not need to zoom much anyway. If you use the DXG in 'basic mode' it zooms up things a bit and displays complex pages like mobile ones. I like this feature.
I'm very happy with my DXG and am quietly-confident that Amazon will update it's PDF capabilities to closely match the current k3 PDF features. Not really sure I care about the browser features since I don't currently have a problem with my DXG browser.
If I were you, I'd keep the DXG and give your parents the k3. They can still crank up the font size ok and will probably find the lighter weight to be more comfortable. As long as you can handle the extra weight, the DXG is the world's best E-book reader imho.
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